Momentum-Apps/_image_tool/_convert_test.c

#include  <stdint.h>
#include  <stdio.h>

#include  "images.h"

//-----------------------------------------------------------------------------
// This will be the plot function out of your graphics library
//
#define  PLOT(x,y,c) do { \
	printf("%s", (c ? "#" : "."));       \
	if (x == img->w -1)  printf("\n") ;  \
}while(0)

//+============================================================================
// The pain we endure to avoid code duplication cleanly
//
#define  PLOTBYTE(b)  do { \
	for (uint8_t m = 0x80;  m;  m>>=1) {                                    \
		PLOT(x,y, (b & m));                                                 \
		if ( ((++x) == img->w) && !(x = 0) && ((++y) == img->h) )  break ;  \
	}                                                                       \
}while(0)

void  show (const image_t*  img)
{
	// Some variables
	const uint8_t*  bp = img->data;
	unsigned int    x  = 0;
	unsigned int    y  = 0;

	// Compressed
	if (img->c) {
		for (unsigned int i = 0;  i < img->len;  i++, bp++) {
			// Compressed data? {tag, length, value}
			if (*bp == img->tag) {
				for (uint16_t c = 0;  c < bp[1];  c++)  PLOTBYTE(bp[2]) ;
				bp += 3 -1;
				i  += 3 -1;

			// Uncompressed byte
			} else {
				PLOTBYTE(*bp);
			}
		}

	// Not compressed
	} else {
		for (unsigned int i = 0;  i < img->len;  i++, bp++)  PLOTBYTE(*bp) ;
	}
}

#undef  PLOTBYTE

//+============================================================================
int  main (void)
{
	show(&img_zzz);
	return 0;
}